[1]任晓阁,龚顺风.竖向不规则钢-混凝土混合框架静力非线性分析[J].防灾减灾工程学报,2019,39(06):912-919.[doi:10.13409/j.cnki.jdpme.2019.06.005]
 REN Xiaoge,GONG Shunfeng.Static Pushover Analysis on Vertically Irregular Steel-RC Composite Frames[J].Journal of Disaster Prevention and Mitigation Engineering,2019,39(06):912-919.[doi:10.13409/j.cnki.jdpme.2019.06.005]
点击复制

竖向不规则钢-混凝土混合框架静力非线性分析()
分享到:

防灾减灾工程学报[ISSN:1672-2132/CN:32-1695/P]

卷:
39卷
期数:
2019年06期
页码:
912-919
栏目:
论文
出版日期:
2019-12-31

文章信息/Info

Title:
Static Pushover Analysis on Vertically Irregular Steel-RC Composite Frames
文章编号:
1672-2132(2019)06-0912-08
作者:
任晓阁 龚顺风
(浙江大学结构工程研究所, 浙江 杭州 310058)
Author(s):
REN Xiaoge GONG Shunfeng
(Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China)
关键词:
竖向不规则钢-混凝土混合框架结构 静力非线性分析 基于多振型侧向力 层间能力系数 破坏模式
Keywords:
vertically irregular steel-RC composite frame structure static pushover analysis lateral load pattern based on multi-modes story capacity factor failure mode
分类号:
TU398.9
DOI:
10.13409/j.cnki.jdpme.2019.06.005
文献标志码:
A
摘要:
根据高阶振型对结构位移的贡献,提出基于多振型侧向力分布形式用于竖向不规则结构的静力非线性分析。通过静力非线性分析和动力时程分析结果的对比,验证了侧向力分布形式的准确性。为研究不规则程度对混合结构非线性行为和破坏模式的影响,改变混凝土框架的刚度和强度形成6个竖向不规则混合结构。通过对不规则混合结构层间能力系数的计算,初步判断混合结构刚度和强度的竖向不规则分布特征,评估可能存在的薄弱层和结构破坏模式。采用所提出的侧向力分布形式分别对结构模型进行静力非线性分析,得到混合结构模型的塑性铰开展特征和层间位移角分布,结果表明:混合结构刚度和强度的不规则程度直接影响结构非线性行为和破坏模式,较均匀的层间能力系数分布能够避免结构中出现明显的薄弱层,使结构破坏模式更加合理。
Abstract:
According to the contribution of high vibration modes to the displacement of structures, a lateral load pattern method based on multi-modes was proposed in static pushover analysis on vertically irregular structures. The accuracy of the proposed method was verified by comparatively analyzing the results of static pushover analysis and dynamic time-history analysis. In order to evaluate the influence of the degree of stiffness and strength irregularity on the nonlinear behavior and failure modes of composite frames, six vertically irregular composite frame structures were prepared by changing the strength and stiffness of the pre-existing RC(Reinforced Concrete)frames. Inter-story capacity factors of composite frame structures were calculated to quantify the stiffness and strength irregularity along the frame height, and consequently predict the weak story and the failure mode of the structures. The formation of plastic hinges and the distribution of story drift ratios were obtained from the static pushover analyses with the proposed lateral load pattern method. Results indicate that the degree of stiffness and strength irregularity directly affects the nonlinear behavior and failure mode of composite frame structures. A more uniform distribution of story capacity factor can avoid obvious weak stories in the structure, and give a more reasonable structural failure mode.

参考文献/References:

[1] Tremblay R, Poncet L. Seismic performance of concentrically braced steel frames in multistory buildings with mass irregularity[J]. Journal of Structural Engineering, 2005,131(9):1 363-1 375.
[2] Zhou J, Zhao W, Mao W. Least favorable probability of failure for 5-and10-story RC frame structures with vertical irregularities[J]. Journal of Earthquake Engineering, 2015,19(7):1 158-1 180.
[3] Michalis F, Dimitrios V, Manolis P. Evaluation ofthe influence of vertical irregularities on the seismic performance of a nine-storey steel frame[J]. Earthquake Engineering & Structural Dynamics, 2006,35(12):1 489-1 509.
[4] 门进杰, 史庆轩. 竖向不规则钢筋混凝土框架结构基于性能的抗震评估方法[J].振动与冲击, 2011,30(6):114-119. Men J J, Shi Q X. New method for performance based seismic evaluation of vertically irregular reinforced concrete frame structures[J]. Journal of Vibration and Shock, 2011, 30(6):114-119.(in Chinese)
[5] Bohlouli Z, Poursha M. Seismic evaluation of geometrically irregular steel moment resisting frames with setbacks considering their dynamic characteristics[J]. Bulletin of Earthquake Engineering, 2016,14(10):2 757-2 777.
[6] 周 靖, 补国斌, 王慧英. 强震作用下竖向不规则结构的延性折减系数研究[J]. 工程力学, 2014(4):189-195. Zhou J, Bu G B, Wang H Y. Ductility reduction factor for vertically irregular structures under strong earthquake actions[J]. Engineering Mechanics, 2014(4):189-195.(in Chinese)
[7] Sarkar P, PrasadA M, Menon D. Vertical geometric irregularity in stepped building frames[J].Engineering Structures, 2010,32(8):2 175-2 182.
[8] Mwafy A, Khalifa S. Effect of vertical structural irregularity on seismic design of tall buildings[J]. The Structural Design of Tall and Special Buildings, 2017,26(18):10.1002/tal.1399.
[9] Chopra A K, Goel R K. A modal pushover analysis procedurefor estimating seismic demands for buildings[J]. Earthquake Engineering & Structural Dynamics, 2002,31(3):561-582.
[10] Belejo A, Bento R. Improved modal pushover analysis in seismic assessment of asymmetric plan buildings under the influence of one and two horizontal components of ground motions[J]. Soil Dynamics and Earthquake Engineering, 2016,87:1-15.
[11] Kalkan E, Kunnath SK. Adaptive modal combination procedure for nonlinear static analysis of building structures[J]. Journal of Structural Engineering, 2006,132(11):1 721-1 731.
[12] Tajik Davoudi A, Abbasnia R, Sarvghad-Moghadam A, et al. An alternative modal combination rule for adaptive pushover analysis[J]. The StructuralDesign of Tall and Special Buildings, 2016,25(7):325-339.
[13] Nezhad M E,Poursha M. Seismic evaluation of vertically irregular building frames with stiffness, strength, combined-stiffness-and-strength and mass irregularities[J]. Earthquakes and Structures, 2015,9(2):353-373.
[14] Chen X W, Li J X, Cheang J. Seismic performance analysis of Wenchuan Hospital structure with viscous dampers[J]. The Structural Design of Tall and Special Buildings, 2010,19(4):397-419.
[15] Eurocode 8: Design of structures for earthquake resistance-Part 1: General rules, seismic actions and rules for buildings[S]. Brussels, Belgium: European Committee for Standardization, 2004.
[16] Lu Y, Gu X, Wei J.Prediction of seismic drifts in multi-storey frames with a new storey capacityfactor[J]. Engineering Structures, 2009,31(2):345-357.

备注/Memo

备注/Memo:
收稿日期:2018-02-25; 修回日期:2018-04-18基金项目:浙江省重点研发计划项目(2018C03033-1)、国家自然科学基金项目(51779223, 51479176, 51009122)资助作者简介:任晓阁(1990-),女,博士研究生。主要从事钢筋混凝土结构抗震性能研究。Email:sugar126@zju.edu.cn通讯作者:龚顺风(1975-),男,教授,博导。主要从事钢筋混凝土结构抗震性能研究。Email:sfgong@zju.edu.cn
更新日期/Last Update: 2019-12-25